Fußball- und Sportverein Mainz 05 e. V., usually shortened to 1. FSV Mainz 05, Mainz 05 [ˌmaɪnts nʊlˈfʏnf] or simply Mainz, is a German association football club, founded in 1905 and based in Mainz, Rhineland-Palatinate. 1. FSV Mainz 05 have played in the Bundesliga, the top tier of the German football league system, for seven consecutive years, starting with the 2009–10 season.
The club’s main local rivals are Eintracht Frankfurt and 1. FC Kaiserslautern. In addition to the football division, 1. FSV Mainz 05 have handball and table tennis departments.
In the 2010–11 season Mainz equalled the Bundesliga starting record by winning their first seven games that season. They ended the season with their best finish to date in 5th place, which was good enough to secure them their second entry to the UEFA Europa League, where they went out in the third qualifying round to Romanian side Gaz Metan Mediaș.